Hi Alexandre,

This seems to be a bug. I am not sure why I missed the 'n' on the name either. As it seems that this function has never worked, we should fix the name as well. The solution is simple as follows:

extra/expr~/vexp_fun.c

188c188

< {"copysign", ex_copysign, 2},

---

> {"copysig", ex_copysign, 1},

I checked the mailing list (I am sorry that I am not a regular reader) and I see some concerns about the maintenance of the code. I am happy to fix the problems and I thought I sent you a fix for the last problem you had found in 2009. Can somebody point me to a document or a webpage that explains what the best way is to introduce new changes to the pd source base. Miller, should I pass the fixes to you, or is there another repository?

In the meanwhile, if there are other bugs in expr that anybody else knows, please send them to me and I will fix them as soon as I can.

best,
Shahrokh

On Sun, Jun 7, 2015 at 12:57 PM, Alexandre Torres Porres <porres@gmail.com> wrote:

hi there, I was checking the source of expr (find it attached) and saw this "copysign" function that I needed for a formula, but I can't get it to work/load.

I'm trying something like [expr copysign($f1)] and it's not happening. The expr manual page in http://yadegari.org/expr/expr.html tells about this function as well, here it is:

copysign()
1
copy sign of a number(added in version 0.4)

So it seems I'm supposedly doing the right thing... is it a bug? I'm on extended 0.42 and it says that it's expr version 0.4 when it loads.

cheers

Shahrokh Yadegari
Professor of Composition and Sound Design,
Theatre and Dance Department
University of California, San Diego
Director, Initiative for Digital Exploration of Arts and Science, (IDEAS)
California Institute for Telecommunications and Information Technologies (Calit2)
Email: sdy@ucsd.edu
Web: http://yadegari.org
Tel: (858) 822-4113
Fax: (858) 534-1080